Ukrainian BTR-4E fires at Russian positions in the village of Hlyboke, Kharkov region. Ukraine has pulled back its troops from several villages in the border region of Kharkiv following continued pressure from Russian forces.
Soldiers had come under heavy fire and moved to "more advantageous positions" in two areas of the north-eastern region, a military spokesman said.
Throughout the course of the two-year war, Ukraine has typically used this type of language to signify a retreat.
President Volodymyr Zelensky has cancelled all upcoming foreign trips as troops struggle to contain the new cross-border incursion, with several towns and villages coming under heavy fire.
His press secretary, Sergiy Nykyforov, said the president had "instructed that all international events scheduled for the coming days be postponed and new dates coordinated".
Moscow has claimed its forces have now taken control of two more settlements in the region - Lukyantski and Hlyboke - and the village of Robotyne, in the southern Zaporizhzhia region.
But Ukraine says its military still controls most of Robotyne, news website Ukrayinska Pravda reports, citing a spokesman for an army brigade fighting there.
"They [Russian troops] are actually only on the outskirts," Serhiy Skibchyk told the website.
"Inside the village, there are still our positions."
Robotyne was one of only a handful of settlements Kyiv retook in its summer counter-offensive last year.

A spokesman for the Ukrainian military said the decision to move troops from the Lukyantsi and Vovchansk areas was taken to "preserve the lives of our servicemen and avoid losses".
The capture of Vovchansk, though not of specific militarily significance, would represent a blow to Ukrainian morale.
The military spokesman said that the situation "remains difficult" but insisted that its forces were "not allowing the Russian occupiers to gain a foothold".
In a statement on Wednesday at 13:30 local time (11:30 BST/10:30 GMT), the military said there had been three clashes in the Kharkiv region, and Russian forces were attacking in the direction of Lyptsi, roughly midway between Kharkiv city and the Russian border.
The statement added two strikes hit the villages of Lyptsi and Mala Danylivka - while Ukrainian forces "repelled" an offensive in Vovchansk.
Later on Wednesday, Ukraine's general staff said heavy enemy fire from Russian forces had prompted the Ukrainian military to reposition some of its troops in the Kupiansk direction, which is some 118 km (73 miles) south-west of Kharkiv city.
It added that it had repelled 20 attacks in that area.
Ukraine's head of intelligence, Kyrylo Budanov, earlier said troops had stabilised the front line.

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